Table 2: Statistics of the field star aperture photometry. For each star the mean magnitude and standard deviation are tabulated, along with the mean of the individual formal errors, and reference magnitude.
Star Mean R-mag $\sigma_{\rm mag}$ Mean formal error Ref. mag

F 13.757 0.0033 0.0030 13.757

G 13.730 0.0029 0.0029 13.730

H 13.977 0.0040 0.0032 13.977

E 14.783 0.0048 0.0047 14.782

D 14.515 0.0045 0.0041 14.515

X 13.422 0.0032 0.0027 13.422

R 16.336 0.0135 0.0123 16.335

**Table 2:** Statistics of the field star aperture photometry. For each star the mean magnitude and standard deviation are tabulated, along with the mean of the individual formal errors, and reference magnitude.
Star	Mean R-mag	$\sigma_{\rm mag}$	Mean formal error	Ref. mag
F	13.757	0.0033	0.0030	13.757
G	13.730	0.0029	0.0029	13.730
H	13.977	0.0040	0.0032	13.977
E	14.783	0.0048	0.0047	14.782
D	14.515	0.0045	0.0041	14.515
X	13.422	0.0032	0.0027	13.422
R	16.336	0.0135	0.0123	16.335

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